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Investment Properties and Properties Held for Sale - Additional Information (Detail) (USD $)	12 Months Ended			3 Months Ended
	Dec. 31, 2014 Tenants State Property	Dec. 31, 2013	Dec. 31, 2012	Sep. 30, 2012
Long Lived Assets Held-for-sale [Line Items]
Property leased to fully constructed fast-food restaurants	11us-gaap_NumberOfRealEstateProperties
Location of properties	4
Number of tenants	11
Partnership recognized income from discontinued operations	$ 208,411	$ 43,147	$ 153,513
Property impairment adjustments	0us-gaap_ImpairmentOfRealEstate	0us-gaap_ImpairmentOfRealEstate	(142,747)us-gaap_ImpairmentOfRealEstate
Wendy's Restaurants [Member]
Long Lived Assets Held-for-sale [Line Items]
Property leased to fully constructed fast-food restaurants	9
Applebee's Restaurant [Member]
Long Lived Assets Held-for-sale [Line Items]
Property leased to fully constructed fast-food restaurants	1
KFC Restaurant [Member]
Long Lived Assets Held-for-sale [Line Items]
Property leased to fully constructed fast-food restaurants	1
Formerly owned, Vacant Phoenix, AZ Property [Member]
Long Lived Assets Held-for-sale [Line Items]
Property impairment adjustments				$ 142,747